Montreal Drinking Water Plants Rehabilitation

The upgrade of two of Canada’s largest drinking water treatment plants will ensure that Montreal residents continue to enjoy drinking water that meets the highest quality standards.

The City of Montreal has launched a large-scale project to improve its Atwater and Charles-J. Des Baillets water treatment plants. Scheduled for completion in 2020, the project involves rehabilitating and upgrading various systems, including the distribution pumps, power supply, ventilation and lighting. It also calls for standards-compliance upgrades and expansion works for the emergency power supply substation serving the Atwater Plant.

Our responsibilities for this project are modelling, conducting preliminary studies, and producing multidisciplinary plans and specifications for procurement and installation. Our teams will also review various technical documents for the client and their in-house engineering team. In addition, we will be responsible for construction supervision.

Building physical and virtual models

Mapping and modeling are excellent ways of ensuring that new equipment additions will complement existing systems and work optimally. As an example, we created physical models of the pump suction piping and sump arrangements, allowing us to verify and improve system hydraulics. This data will give us the information we need to improve system efficiencies, resulting in long-term operations and maintenance cost savings.

We also produced 3D surveys of the high-pressure pumping rooms at the Atwater plant, as the various building systems have evolved significantly since the facility’s inauguration in 1918. Having a good understanding of what is inside the heritage building allowed us to design systems that would fit within the limited available space and preserve the historic architecture.

Ensuring uninterrupted service

Since the Atwater and Charles-J. Des Baillets water treatment plants produce 88% of Montreal’s potable water, it’s essential that they remain fully operational at all times during the rehabilitation and upgrade works. We’ve planned progressive system transfers—including some temporary installations—to ensure that all mechanical and electrical needs are met at all times.